at the state department margaret brennan reports secretary clinton promises a full accounting. >> reporter: were there requests for increase in security in tripoli and benghazi and can you address whether washington or your office rejected those requests? >> let me start by cautioning everyone against seizing on any single statement or piece of information to draw a final conclusion. over the course of this review there will naturally be a number of statements made, some of it -- some of which will be borne out and some of which will not. >> reporter: clinton and her aides have consistently pointed to intelligence reports that indicated there was no threat to the u.s. mission, and that it was intelligence agencies that initially said the attack was sparked by a spontaneous demonstration. >> i am aware too that many people are eager for answers. so am i, margaret, and no one wants the answers more than we do here at the department. >> reporter: senior aides are handing over emails and paper work to congressional investigators who want to know who knew about the security situation in benghaz